Needle valve



P. l.. SCOTT NEEDLE VALVE Feb. 4, 1930.

Filed March 10, 1924 1. 2. 37W n .y IK f mi z 2W? z TJ ya L W WHA Haz? @IM Patented Feb. 4, `1930 UNITED STATES PATENT OFFICE PHILIP LANE SCOTT, OF CHICAGO, ILLINOIS, A SSIGNOR T SUPER DIESEL TRACTOR CORPORATION, OF LA PORTE, INDIANA, A CORPORATION OF NEW YORK NEEDLE VALVE This inventionrelates to a valve intended primarily for use in injecting liquid` fuel j drawings, wherein into an internal combustion engine. It may be used, however, for many other types of spraying injection and atomization.

The 'invention is illustrated more or less `diagrammatically yin the accompanying Figure l is a longitudinal cross section `of the valve and a portion of the engine cylinder; showing also som-e parts of the valve in elevation; l

Figure 2 is a fragmentary cross section similar to the lower endof Figure 1 and on an enlarged scale;

Figure 3 is a 'detailed cross section of the main valve disc, on an enlarged scale;

n Figure 4 is a vertical cross section on an enlarged scale showing the s eat plug as illus'- trated in Figures 1 and 2;

Figure 5 is a similar view showing a modified form.

Like parts are designated by like characters throughout.

A is a portion of an engine cylinder., per-- forated as lat A1, the perforation A1 being threaded at A2 to receive the' valve.

B is a valve capk threaded at its lower end as.v at B1 and adapted to contain the valve parts and to be inserted into the perforation A1 of the cylinder wall A. -The body B is provided adjacent its lower end with an inwardly projecting flange B2 adapted to receive the valve discs, which will be described later.A l

C is the valve body. It is hollow as shown and is provided in its lower end' with an annular groove C1. Adjacent its middle it is threaded, as at C2, and is' provided with an enlarged Aportion C3, above the threaded portion. bore of the valve cage islocated an air escape vpassage C5 which is controlled by a needle valve D, which may be moved by a knurled wheel D1. Communicating with the passage C5 and extending from it to any suitable point of escap-ement is a passage C6. At'its upper end the body C is screw threaded as at C.` The ybore of the body C is enlarged adjacent its upper end as at C8 and is thread- Communicating with the central.

ed interiorly as at C". Within this bore a packing E is placed and is held in position by the threaded gland E1.

About the upper end of the valve cage is mounted a threaded collar F. This collar carries an upwardly extending portion F1 which at its upper' end joins a laterally eX- tended collar F2. This collar may be rotated -aboutthe valve body'so as to raise and flower the valve stem with relation thereto and to cause adjustment within the valve.

Located within the valve body and supported on the flange B2 is a composite or laminated valve disc Gr. In the form shown the several discs making up the laminated disc are not fastened together but are merely n held in the relation shown. This disc is provided with the central perforation G1 which is preferably enlarged downwardly. Forming the top of the composite valve disc G is a valve disc H. This disc member is provided with a central perforation which has about it a vertically extending annular flange and has provided on its upper face, an annular projection H2., the up er edge of which is sharpened. P is a pac ing ring, preferably of soft metal such as copper, and it is forced into the groove C1 by the annular projection H2.

Mounted within the perforation in the discs is a seat plug I. This plug is provided with a lateral retaining flange I1 which prevents its being forced through the perforation in the valve disc. It has extending downwardly from its upper face, in the form shown in Figures 1, 2 and 4, a perforation J. This perforation communicates with a perforation J1 of reduced size, and the perforation J1 is provided with the downwardly flaring mouth J 2.

'Figure 5 illustrates a modied seat plug K which is provided with a laterally eX- tending flange K1 and a single bore K2 of substantially constant size, having a downwardly flaring mouth K3. 1

Within Ithe bore of the valve body is th valve stem L. This stem is narrowed preferably throughout the larger portion of its length and is provided with the guides L1 which contact the walls of the bore in the `-lo a portion L of y 60 extending t yalve cage C and guide the stem. While I prefer to use these guides, they may be omitted. At is lower end the stem L is threaded as at L2. It is adapted-to receive a needle point M which point is locked in position on the valve sternl by means ofthe locking nut MH The needle point M is normally seated in the perforation of the seat plug I as shown in Figures 1 Aand 2. Throughout itsupper length the stern L is enlarged as at La. Throughout this enlarged portion it is provided with the interior bore L4. .l Communicating-with this bore and opening into the interior of the valvej body are ports L5. At its upper end the stem is provided with the enlarged threaded portween said stem and said body, -a flemble perforated disk closing the discharge end of said bore and provided with a seat surrounding said,w perforation, and adjustable means cooperating with the exposed end of said stem whereby to position said valve-in engagement with saidseat, said exposed end of the stem 'zov being adapted to be coupled withan oil sup-A Signed at Chicago, countyof Cook and State of Illinois, this 7th day of March, 1924.-

HILrr LANE scorn v tion N and the laterally extending flange l i N1. This flange rests upon the collar F2 and when the collar is raised, bears against it and i 2@ is raised with it and so raises the valve stem l with it. Beneaththe flange N the valve stem is provided with a threaded portion as `at O. About this ortion are m`unted a pair of locking nuts 1. These nuts are .locked into 25 position so that when the collar F2 is lowered lit will bear against them "and the valve will begforced downward. Thus the collar F2 and its attendant parts form a means for adjusting the yalve stem in and out. i Although I have shown an operative device, still it-will beobvious that many changes elsa' in size, shape and arrangement o'f parte may be made without departing materially 'from the spirit ofV my invention, and I wish therefore that myshowing be taken as in a sense diagrammatic. The use and operation of my invention are as follows:

When itis desired to use the valvezto spray 40 or inject or atomize liquid, the parts are assembled as shown. Liquid is lforced into the interior of the valvev under pressure. vThe escapement vprovidedby the needle valve D is used in order to permit the escape of'air,

.45 which may have gotten in the supply line.

Under operating conditions this escapement is, of course, closed. Fuel beingfforced vinto the valve under suiiicientpressure, the valve discs are bent outward and so move away y from the needle point and thus permit disv charge and atomization of the fuel from the valve. When the pressure is reduced, the discs 'move back and the valve is again. seated and closed and discharge is stopped. I'claim: l, I In-an injection atomizer, a valve body havlng a longitudinal bore therethrough, a'needlev valve disposed within said bore adjacent to end thereof and having a stem' rough said bore andg'exposed at the inlet end thereof,".the exposed? of said stem being provided with `an axia -'.;`assage-.

.P way opening into sald bore, the stem beyond the dischargp said opening being of less-.diameter than sid l '6a bore, packing meanszlsealng thevjoint e- 

